Phenology
| Year | Migration site | First | Migration site | Last | |||||
|---|---|---|---|---|---|---|---|---|---|
| 2022 |  |
VRS Castricum | 9 June | |
VRS Castricum | 25 July | |||
| 2021 | |
VRS Castricum | 10 February | |
VRS Castricum | 5 May | |||
| 2020 | |
VRS Castricum | 6 June | |
VRS Castricum | 7 July | |||
| 2019 | |
VRS Castricum | 26 May | |
VRS Castricum | 26 May | |||
| 2018 | |
VRS Castricum | 5 March | |
VRS Castricum | 6 July | |||
| 2017 | |
VRS Castricum | 26 July | |
VRS Castricum | 26 July | |||
| 2016 | |
VRS Castricum | 22 July | |
VRS Castricum | 8 November | |||
| 2015 | |
VRS Castricum | 28 July | |
VRS Castricum | 28 July | |||
| 2014 | |
VRS Castricum | 12 May | |
VRS Castricum | 12 May | |||
| 2013 | |
VRS Castricum | 19 January | |
VRS Castricum | 30 March | |||
| 2012 | |
VRS Castricum | 5 February | |
VRS Castricum | 19 May | |||
| 2011 | |
VRS Castricum | 7 July | |
VRS Castricum | 15 July | |||
| 2010 | |
VRS Castricum | 20 June | |
VRS Castricum | 25 December | |||
| 2009 | |
VRS Castricum | 10 January | |
VRS Castricum | 20 December | |||
| 2008 | |
VRS Castricum | 13 June | |
VRS Castricum | 3 July | |||
| 2007 | |
VRS Castricum | 24 June | |
VRS Castricum | 29 July | |||
| 2006 | |
VRS Castricum | 23 June | |
VRS Castricum | 6 August | |||
| 2005 | |
VRS Castricum | 1 July | |
VRS Castricum | 10 August | |||
| 2004 | |
VRS Castricum | 31 May | |
VRS Castricum | 4 July | |||
| 2003 | |
VRS Castricum | 15 June | |
VRS Castricum | 27 June | |||
| 2002 | |
VRS Castricum | 6 July | |
VRS Castricum | 16 July | |||
| 2001 | |
VRS Castricum | 23 June | |
VRS Castricum | 29 July | |||
| 2000 | |
VRS Castricum | 2 June | |
VRS Castricum | 3 August | |||
| 1999 | |
VRS Castricum | 6 June | |
VRS Castricum | 13 June | |||
| 1998 | |
VRS Castricum | 7 June | |
VRS Castricum | 19 July | |||
| 1997 | |
VRS Castricum | 9 January | |
VRS Castricum | 17 July | |||
| 1996 | |
VRS Castricum | 5 January | |
VRS Castricum | 14 July | |||
| 1995 | |
VRS Castricum | 25 March | |
VRS Castricum | 31 December | |||
| 1994 | |
VRS Castricum | 29 May | |
VRS Castricum | 3 July | |||
| 1993 | |
VRS Castricum | 1 January | |
VRS Castricum | 9 August | |||
| 1992 | |
VRS Castricum | 25 January | |
VRS Castricum | 31 December | |||
| 1991 | |
VRS Castricum | 15 January | |
VRS Castricum | 16 October | |||
| 1990 | |
VRS Castricum | 25 April | |
VRS Castricum | 25 April | |||
| 1988 | |
VRS Castricum | 2 December | |
VRS Castricum | 2 December | |||
| 1987 | |
VRS Castricum | 13 January | |
VRS Castricum | 25 February | |||
| 1986 | |
VRS Castricum | 10 February | |
VRS Castricum | 2 March | |||
| 1985 | |
VRS Castricum | 18 January | |
VRS Castricum | 31 December | |||
| 1984 | |
VRS Castricum | 24 January | |
VRS Castricum | 24 January | |||
| 1981 | |
VRS Castricum | 17 December | |
VRS Castricum | 20 December | |||
| 1980 | |
VRS Castricum | 9 October | |
VRS Castricum | 9 October | |||
| 1979 | |
VRS Castricum | 2 January | |
VRS Castricum | 15 February |
